Lock.



No. 783,351. PATENTBD FEB. 21, 1905. G. W. ABERNETHY. LOCK.

Snow W01,

war/"059% (66 flmeihy my Y l K v I awe (mags UNITED STATES Patented February 21, 1 5.

' GEORGE W. ABERNETHY, OF LOWELL, NORTH CAROLINA.

LOCK.

SPECIFICATION forming part of Letters Patent No. 783,351, dated. February 21, 1905.

Application filed April 22, 1904. Serial No. 204.447.

To (all whom it may concern:

Be it known that I, GEORGE W. ABERNETHY, a citizen of the United States, residing at Lowell, in the county of Gaston and .State of North Carolina, have invented certain new and useful Improvements in Door-Locks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to locks, and more particularly to combination-locks, and has for its object to provide a lock which while being provided with the usual key-operating mechanism will also have a mechanism which may be brought into position to prevent the operation of the key mechanism and which will be provided with dials to indicate its operative position.

Other objects and advantages will be apparent from thefollowing description.

In the drawings forming a portion of this specification, and in which like numerals of reference indicate similar parts in the several views, Figure 1 is a side elevation of the lock. Fig. 2 is a longitudinal section of Fig. 1. Fig. 3 is a section on line 3 3 of Fig. 1. Fig. 4 is a detail view of the disks separated.

Referring now to the drawings, there is shown a lock comprising a casing 5, having a plate 6 slidably disposed therein and which has a lug 7 projecting therefrom, which forms the bolt and which lies in an opening 8 in the forward edge of the casing. The plate 6 has an opening 9 therein communicating with its upper edge, which may be engaged by the leaf 10 of a key to move the plate. The plate also has notches 13 and 1 1, which are-disposed to be engaged by a lug 15, carried bya spring 11, to hold the plate at the forward and rearward limits of its movement. The plate 6 has also rearwardly-extending lugs 17, 18, and 19, the central lug 19 being somewhat longer than the others, and disposed in the paths of movement of each of these lugs is a pair of disks 20 and 21, there being three sets of these pairs of disks 22, 23, and 24, as shown. The three sets of disks are arranged in the same manner, so that a description of one will sufiice for all.

As shown in Fig. 3, the face of the casing 5 is provided with perforations 25, in which are revolubly mounted shafts 26,having knobs 27 upon their outer ends, which are provided with collars 28, having characters marked thereon, which may be registered with similar characters marked on plates 29, which surround the perforations 25. To the inner ends of the shafts 26 are rigidly secured the disks 20, while the disks 21 are revolubly mounted upon the shafts between the inner face of the casing and the disks 20. As mentioned above, the several pairs of disks are identical. Each disk 20 has a notch 20, which may be alined with a similar notch 21 in the disk 21, both of the disks being movable to bring their alining notches into position to permit the free end of one of the rearwardly-extending lugs to enter thereinto. When the notches of the several disks are all thus positioned, the plate 6 may be moved rearwardly to retract the lug 7 into the casing; but if one or a number of the disks be, out of such position rearward movement of the plate is prevented, as will be readily understood. The disks 20 may of course be moved into position to permit rearward movement of the plate through the medium of the shafts 26, to which theyare attached, this position being indicated by registration of certain of the characters on the collars 28 and plates 29. The disks 21 being revolubly mounted upon the shafts 26, a special construction is necessary to revolve them. Each of the disks 21 has an arc-shaped groove 30 in its face, which lies next to the disk 20, andin this groove their lies a lug 31, which projects from the inner face of the disk 20. It will thus be seen that if the disk 20 be revolved until its lug 31 strikes against one end of the groove 30 further movementof the disk 20 will carry the disk 21 therewith and will bring its notch 21 into operative position, after which the disk 20 may be moved, as described above, to aline its notch 20 with the notch 21, it being understood that the operative position of the notch 21 is indicated in the same manner as that of the notch 20; To prevent derangement of the disks after their notches have been brought into operative position, spring-plates 32 and 33 are disposed to bear against the outer edges of the sets 22 and 23 of the disks, these plates having their ends engaged against lugs 34: and 35, which project from the top and bottom of the casing, and a similar plate 36 is bowed around the set of disks 24 and has its free ends engaged between the sets 22 and 23, against which they bear.

In practice modifications of the specific construction shown may be made and any desired materials may be used without departing from the spirit of the invention.

What is claimed is In a lock, the combination with a slidablymounted bolt arranged for operation by a 

